The Other Bande son (1972) BO

In the summer of 1935, 12-year-old twins Niles and Holland Perry live with their family on a Connecticut farm. Their loving grandmother Ada has taught them something called "the game." A number of accidents begin happening, and it seems to Niles that Holland is responsible. It is Ada who begins to see the truth, and she is the only one who can stop this macabre game of murder.